“Said, the Frontier was a safety valve for civilization.”
Why it's great
One metaphor turns a whole theory of history into a line you can carry around.
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Formal
Use it yourself
For many workers, sport is a safety valve.
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Cody Explains the Frontier Theory, Explained
Interstate 60 · 2002
Chapter 15 of 22 · 3'43"
On the road, Cody explains Frederick Turner's frontier theory to Neal: the frontier was civilization's safety valve, a place for people who couldn't fit in. When Neal asks whether it's really true, Cody answers, 'If it isn't, it should be.' The detour turns a history lecture into a theory of why Interstate 60 exists.
Key moments
Start here, then watch the full scene- 1:43–2:21
❝ Monologue · 13 lines Cody's Frontier Theory
38s - 2:29–2:54
❝ Monologue · 6 lines Cody debunks fake frontiers
He dismisses drink, drugs and computers in turn, and the sarcasm keeps building.
25s
Cody Explains the Frontier Theory, explained
What happens
Neal and Cody, the tow-truck driver, talk about roadside signs and the lies in advertising. When Neal admits he is nervous about meeting Robin Fields in Danver, Cody advises him to say nothing and let her start. Cody then explains the historian Frederick Turner's theory that the frontier was a safety valve for civilization.
What's really going on
Cody's history lesson is really a defense of the road they're on. Turner's frontier, he says, was where a society sent its misfits so the rest could stay sane — 'the Frontier was a safety valve for civilization.' When the physical frontier closed, people looked for replacements: alcohol, drugs, computers, even a paid-access 'phony frontier.' Cody dismisses each one and points back to Interstate 60 as the real thing. But his whole story rests on a wink: when Neal asks if it's true, Cody says, 'If it isn't, it should be.' The myth is useful, and that's the point. The scene argues that a frontier is less a place than a pressure release people need.
Key lines & what they mean
- “Said, the Frontier was a safety valve for civilization.”
- Turner's core idea, as Cody tells it: the frontier let society release its misfits, which kept the rest from going mad.
- “- If it isn't, it should be.”
- Cody's answer when Neal asks if the theory is true: whether or not it happened, it makes a useful and fitting story.
- “Which is why all the nuts eventually ended up in California.”
- Cody's joke that follows the westward move — the outliers kept pushing west until they reached the coast.
- “Some people say, we have a frontier in the mind.”
- The idea Cody then knocks down: a mental escape like drink or drugs isn't a real frontier, just another way to fool yourself.
Theme
- Philosophy — Cody turns a historical theory into an argument that people always need an open frontier to stay sane.
- Dreams — Interstate 60 is framed as the last real frontier, a place for anyone who wants something different.
What this chapter teaches
Teaching points
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Language points
Click a card to jump to its moment in the videoGolden lines
A great line in its own right — why and how to use it“- If it isn't, it should be.”
Why it's great
It quietly admits the story may be invented and insists it deserves to be true anyway.
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literary
Use it yourself
If that legend isn't real, it should be.
“Which is why all the nuts eventually ended up in California.”
Why it's great
It lands a long historical argument as a punchline about one state, which is very Cody.
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Informal
Use it yourself
Which is why all the dreamers ended up in that city.
“Some people say, we have a frontier in the mind.”
Why it's great
It moves the idea of a frontier from land into the human mind in one line.
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Neutral
Use it yourself
Some people say, we have a whole country in the mind.
Monologue
One character carrying the scene — shadow the whole passage❝ Cody's frontier lecture
- Well, he was an historian. About a hundred years ago, he came up with the theory about the frontier. Said, the Frontier was a safety valve for civilization. Place for people to go, to keep them from going mad. So whenever there were folks, who couldn't fit in with ways things were... Nuts, malcontents, and extremists... They'd packed up and head for the frontier. That's how America got started. All the crackpots and trouble makers in Europe, packed up, and went to a frontier, which became The Thirteen Colonies. When some people couldn't fit in with that, they moved farther west. Which is why all the nuts eventually ended up in California. Turner died in 1932, so. He wasn't around long enough to see what would happen to the world, when we ran out of frontier.
He expands one historian's idea into a theory of America, feeding in jokes as he goes.
❝ Cody debunks fake frontiers
Some people say, we have a frontier in the mind. And they go off and explore the wonderful world of alcohol, and drugs, but, that's no frontier. It's just another way for us to fool ourselves... And we've created this phony frontier with computers. Which allows people to think they've escaped... Frontier with access fees...
He dismisses drink, drugs and computers in turn, and the sarcasm keeps building.
Up next · 16hold someone to somethingThe scene: Cody Makes a Panhandler WorkTakeaways
What you walk away with- Cody turns a road trip into a history seminar.
- The frontier idea reframes restlessness as a national habit.
- His sarcasm keeps the lecture from sounding solemn.
- Every detour lands back on the highway itself.
People also search
Questions, then the linesWhat is Frederick Turner's frontier theory?
It holds that the frontier acted as a safety valve for society, giving restless or unadapted people somewhere to go so the settled world could remain stable.
Why does Cody say Interstate 60 is the last frontier?
Because the real frontier is closed and its substitutes — drink, drugs, computers — are fake. He argues the road was built as a genuine place for people who want something different.
What does Cody mean by 'If it isn't, it should be'?
He admits the story may not be literally true but insists it deserves to be, because the myth is useful. It's his way of saying the meaning matters more than the facts.
Why is Neal nervous in this scene?
He is on his way to meet Robin Fields, the woman from the sign, in Danver. He asks Cody how to start a conversation without looking foolish.